Means for preventing double exposures.



R. C. PETERSON; MEANS FOR PREVENTING DOUBLE EXPOSUBES. APPLICATION FILED DECAL-18H.

gnmcm to'a "F6. C-FETEREJON R. C. PETERSON. MEANS FOR PREVENTING DOUBLE EXPOSURES.

APPLICATION FILED DEC. 12, 1917.

Pa-tentfid Dec. 31, 1918.

3 SHEETS-'SHET 2.

R. C. PETERSON.

MEANS FOR PREVENTING DOUBLE EXPOSURES.

APPLICATION FILED DEC. I2. 19H.

3 SHEETS-SHEET 3.

J jg 15 8, H gnaw/atom J fi/ K/J K 79 cPETEFi ioN srntrns r2 RICHARD C. PETERSON, OF MALDEN, WASHINGTON.

MEANS FOR PREVENTING DOUBLE EXPOSURES.

Application filed December 12, 1917. Serial No. 206,799.

To all whom it may concern Be it known that I, RICHARD 'C. Pn'rnnsox, a citizen of the United States, residing at Malden, in the county of Whitman and State of \Vashingtomhave invented certain new and uset'nlImprovements in Means for Prevent ing Double Exposures, of which thefollowing is a specification, reference being had to the accompanying drawings. i

This invention relates to photographic cameras. and 'iarticularly to means for pre venting double exposure.

ln taking pictures with ordinary film cameras, double exposures are quite likely to occur. becauseot the operator forgetting to wind the film roll at the making of an exposure. so that the next exposure is made on the same film, thus ruining two pictures.

The general object of this invention is to remove all chances of double exposure by n-oviding a member movable into an obstructing position by the action of snapping the shutter. but shi't'table out of an obstructing position by the actionof winding up the exposed film. this member being specifically either a shutter obstructing member or a finder obstructing,- member.

A further object of the invention is to provide a device of this character, which is so arranged that the finder on the camera may be shifted into either of its two posi tions, without requiring any adjustment 0t the attachment. i

btlll anodier object is to P1O\1(l6 a device ot this kind H1 which the mechanism is ad- JllSt'dldU with all the ad ustments of the camera. either for focusing: the lens or for raisine or lowering the lens.

And another ob ect is to provide means whereby the indicator and the mechanism for actuatln the indicator are actuated 'bv the cable release or other shutter operating f mechanism.

Other objects will appear in the course of the tollowinp; description My invention is illusti-ated in the accompanying drawings wherein:

Figure 1 is a front view of a film camera equipped with one form of finder and having my attachment applied thereto;

Fig. 2 is a side 'viewof the camera illustrated in. Fig. 1 the parts being broken away;

Fig.3 is a side" elevation of the clutch device, the adjacent portions of the camera being in section; 1

Fig. is a front elevation of the-clutch device shown in Fig. 3;

Figs. 5 and 8 are diagranm'iatic vertical sections through the clutch showing the op eration of the clutch. these views being taken on the line 5--5 of Fig. 4;

Fig. 7 1s a fragmentary sectional view showing the clutch connection on the shaft;

Figs. 8 .and9 are front elevations of an other form of finder showing my attachment applied thereto,a portion ot'Figzt) being broken away;

F ig. 10 is a perspective view showing the indicating arm and the connecting rod for operating it;

Fig. 11 is a fragmentary vertical scctional view showing the ring in which this indicating arm is mounted;

Fig: 12 is a vertical sectional view through one wall of the camera on the line 12-12 of Fig. 2:

Figs. 13 and 14 are detailed fragmentary views showing the application of 11W device to another form of finder;

Fig. 15 is a perspective detailed view of one of the racks and the signal or indicator actuating arm coacting therewith;

Fig. 16 is a perspective view of a modified form of indicator;

Fig. 17 is a face view of part of the shutter mechanism of the camera showing my mechanism applied to locking theshuttor: and

Fig. 18 is a vertical longitudinal section through the mechanism illustrated in Fig. 17. I

Fig". 19 is a view showing in side elevation the clutch connection to the indicator and the winding key and a flexible shaft extending from. the. pinion actuated by the winding; key to clutch coni'iection.

As before stated, the general object'ofthis invention is to prevent double exposures by providing an indicator or signal which, when an exposure is made. is automatically shit'table toa position across the finder, so that. it the photographer desires to take anotherphotograph and has not wound up the film so as to present a new film for exposure this fact will be indicated by the presence of the indicatorextending across the finder.- There are a number of different forms of, finders used in connection with various makes of film carryin c pocket cameras and, therefore. in the accompanying drawings, 1 have illustrated how my invention may be'applicd to finders of different types. I have only illustrated one form of finder 1n connectlon with the compiete camera. but it is to be understood that able construction and that the attachment is not limited to use with a camera constructed asindlcated 1n the drawing. The bracket 14 is, as usual, ad ustable in slldes toward or from the body 10 so as to secure the proper focusing of the lens and also to permit the bellows and the lens plate with the lens to be inclosed within the body 10, but this mechanism whereby the bellows is contracted or expanded and whereby the lens plate is held in adjusted positions on the door 13 is notillustrated as it is of the ordinary type and forms no part of my invention.

The shutter of the lens is operated by means of the usual cable release 15. The tube of this cable release, however, is branched, one branch extending to the operating mechanism of the shutter and the other branch extending to a point beneath the finder 17 in Figs. 1 and 2. This branch 16 is provided at its extremity with a head 18, which is shift-able outward upon an actuation of the cable release, this head being provided with a shank which operates in any suitable guide. It will thus be seen that coincidently with the operation of the shutter the head 18 is shifted outward.

The finder 17 illustrated in Figs. 1 and 2 is of that type wherein a frame rotates around a relatively fixed lens, this lens being supported in a lens ring 1!). Mounted on the inside of the lens supporting ring 1!) is an indicator 20, illustrated in Fig. 10, this indicator-being pivoted as at 21 and haning an outwardly projecting arm 22. A connecting rod 23 is pivotally connected to lhe extremity of this arm 22, the arm 22 acting as a crank arm. \Vhcn the arm 23 is drawn in one direction, the curved indicator or signal 20 will be thrown up to a position across the lens. as illustrated in Fig. l and when the rod 23 is thrown in the. opposite direction, the indicating arm will be shifted to a position where it leaves the sight-opening through the lens entirely .nnexposml.

Mounted upon the supporting plate 12 of the camera is a shaft 24, which extends toward the body of the camera and is disposed necting rod 23 will be shifted to project the indicator into the field of the finder lens or retract the .indicator from said field. Mounted upon'the extremity 'of the shaft 24, as illustrated'in Fig. 7, is a beveled gear wheel 27. In Figs. 8 and 9 I show a finder wherein the lens 29 and the body 28 of the finder rotates within a frame 30. This is a common type of finder mounting and needs no further description, but in this case I make the frame 30 U-shaped in cross section and the indicator 20, which is the same as the indicator previously described, is mounted upon this'relatively fixed frame 30 between the sides thereof. This indicator 20, of course, is pivoted at 21 and has the arm and the connecting rod 23 carrying an eccentric ring at. its lower end. For the purpose of rotating the shaft 24., I provide .a sliding rack 18, engaged by the head 18, and a toothed gear 24 with which the rack 18 engages.

Extending parallel to the plate 12 and disposed inward thereof, is a shaft 31, which is preferably made in two telescopic sections,

lower end of the shaft 31 carries upon it a beveled gear wheel 32 and mounted upon the door 13 is a shaft 33, the outer end of this shaft carrying a relatively elongated gear cylinder 34. that is, a gear wheel which is relatively elongated. This shaft 33 is mounted in suitable bearings and is preferably in two sections, the sections having telescopic engagement with each other and rotative engagement with each other.

Mounted upon the bracket 14. or in any other suitable manner, is a short .iorizontal shaft 35, carrying on oneend a beveled gear wheel 36 which engages the beveled gear wheel 32, and carrying at its opposite end the gear wheel 37, which engages with the toothed cylinder 34. It will thus be seen that as the cylinder 34 is rotated. it will cause the rotation of the shaft 31 and a rotation of the shaft 24, and it will likewise be seen that the toothed cylinder which conbeveled gear wheel :10. Disposed in the end Wall 41 of the camera is a shaft 42, which carries at its iower end a beveled gear Wheel 43, engaging in turn with a beveled gear wheel 4-1, mounted upon a shaft 45, which extends inward through the side wall 4-1, this shaft 45 carrying upon it a beveled gear wheel 46, which engages with the beveled gear wheel 40. At its upper end the shaft 42 carries a beveled gear wheel d7, which is disposed in a recess 48 opening upon the face of the end wall. Disposed in the face of this end wall is the usual cup-shaped metal lic ferrule 49, through which the usual winding shaft 50 of the camera passes. This winding shaft carries a key 51, whereby it may be rotated, this key being foldable into' the depression formed by the cup-shaped ferrule 49. Mounted upon this shaft 50 is a beveled gear wheel 52, which meshes with the gear wheel 47, and thus it will be seen that when a film is wound up in the usual manner by rotating the key 51, the shaft 42 will be rotated, and this will rotate the shafts 45 and 39, and this. rotating the shaft 33, will cause a corresponding rotation'of the shaft 31 and a rotation of the shaft 24 which will carry the indicating finger out of its exposed position and into its unexposed position.

I have described the gear wheel 40 as if it were directly mounted upon the shaft. sec tion 39,-but in order to prevent more than a quarter turn of the shaft 24, l have provided a peculiar clutch member illustrated in Figs. 3 and t. Loosely mounted upon the shaft 39 is the gear wheel 40, as previously described, and this gear wheel is provided with a. hub formed with clutch teeth 54. Slidably mounted upon the shaft 39 to turn therewith is a clutch member having clutch teeth engaging with the teeth 54, this clutch member being urged into engagement with the teeth 5-? by means of an intcrnal spring 56. This clutch menrber is provided, as illustrated in Fig. 4, with a radially projecting arm 57.

base all of the camera and arching over the shaft section 39 and specifically over the clutch member '1n concentric relation thereto. is a bracket 58. and mounted upon this bracket is an arcuate bar 59. having an angular length equal to one quarter of a circle. in other words, equal in angular length to the angular movement. of the indicating arm 20. onsetplently, if the arm 20 moves to an extent greater than 99, the bar 59 extends throu h a len th reater than h V b a 90 and vice versa. Disposed behind the bar 59. and parallel thereto, but extending beyond the lower end of the bar 59, is a spring (30, the lower end of this spring being outwardlyturned as illust 'ated in Figs 5 and 6. This spring is spaced from the inner face of the bar 59 a sufficient distance to receive the pin or arm 5'5.

lho shaft section 39.

Mounted upon the Normally, that is, before the exposure made, the pin 57 is disposed in the dotted line position in Fight, andfin the position shown at (r in Figs. 5 and (i. The exposure is made and the movement of the shaft 24 through a quarter circle caused by the sliding movement of the rack bar 18. through the gears 27, the shaft 31 and the. gears 32, 35 and 37 and allied parts. rotates the shaft 39 in a clockwise direction so as to carry the pin or arm 57 from the lower end of the bar 51 upward and beyond the upper end of the bar, the clutch member 55 beingheld out of mesh with the teeth 54 by this bar 59, which constitutes a guard. When the pin 57 has passed the upper end of the member 59, the spring in; will cause the clutch member to move inward and engage with the clutch teeth 54. I I

Now when the exposed film is wound up, the rotation of the key 51- causes a rotation of the gear wheel d) in a counter-clockwise direction and the arm 57 on theclutch 5 will move down, as illustrated in 'Fig. 5, between .the inner face of the member 59 and the spring (30. The clutch member-will remain in engagement with the teeth 54 until the pin 57 has passed beyond the lower endof the member 59, when the deflected lower end of the spring (30 will shove the pin 57 outward, shifting the clutch 55 outward against the force of the spring 56 and disengaging the clutch member from the teeth 54, it being understood that the spring (30 is stronger than the spring 56. Thus the clutch member will be disengaged from the gear wheel ll), after the clutch member and the shaft section 39 has made a'quarter rotation, which will bring the indicator 2() back to its initial position. A further rotation of the film winding spool and of the shafts 41 and 45 will not. therefore; affect in other words, the object of the particular form of clutch illustrated in Figs. 53 and r is to prevent an) 'rotation of the shaft 39 and of the parts connecting this shaft with the indn-ator-beyond a quarter turn or a movement sutlicient to shift the indicator from its effective indicating position to its ineffective position.

' While I have illustrated the clutch shown in Fig. 3 as being disposed upon the shaft section 39 and adjacent to the gear wheel 40, I wish it to be understood that this clutch might be disposed anywhere. between the g atwheel 40 and the indicator. Thus it might be used betweenthe gear wheel 27 and the forward end of the shaft 2-1. and in this case. there will b e less resistance offered to. the movement. of theplunger 18 than is the case where the clutch is disposed as in Fig. 3. Other means may be n'ovided as will now stated for operatively disconnecting the shaft 24 from the train of gear f in Fig. 7, i; show a much simpler construction, which may he used for the purpose above stated. In this figure, the shaft 24 has loosely mounted uponit-the gear wheel 27, and this gear wheel 27 is operatively engaged with the shaft 2& by means of what is practically a friction clutch comprising a member (31, slidably mounted upon the shaft 2% and splined thereto and urged toward the clutch member (32 carried by the gear wheel 27, the clutch members 61 and 62 being provided with relatively shallow clutch teeth which may readily slip by each other whenthere is a considerable impediment to movement. With this construction, when the key .51 is turned, rotation will be transmitted in the manner heretofore de scribed, to the gear wheel 27, and inasmuch as the work to be done by the rotation of the shaft 2-t, that is, the shifting of the indicator 20, is relatively light, the clutch members (31 and (32 will be held in engagement with each other and the shaft 24 will rotate with the gear wheel 27 until such time as the indicator has reached its retracted positlon. A stop 63 may be provid d on the shaft 24, which will engage with a fixed stop 63 when the shaft 2-1 has made a quarter revolution and when these stops are engaged with each other and the shaft can rotate no farther, because the indicator has been thrown to its fully retracted position, then the continued revolution of the gear wheel 27 will cause the clutch faces of the clutch members (31 and 62 to shift past each other, 'hen an ex posure is made and the plunger 18 is shifted to shift the rack 18 which engages the gear wheel 24 on the shaft 24, the shaft 2i will rotate, but the resistance to the rotation of the gear 27 will be so great, due to the train of gears and shafts connected thereto, that the clutch members 61 and 62 will slip on each other and there will be relatively slight impediment to the movement of the shaft'Q r. \Vhile I have illustrated a. particular form of friction clutch, it will be understood that otherforms of clutches equivalent in operation thereto may be used. I

In Figs. 13, 14 and 15 I show the manner in which my mechanism 'is applied to a cam-- era wherein the finder frame itself is piw otcd upon the camera and is rotated upon this pivot in order to turn the finder into a position for taking horizontal pictures or vertical pictures, that is, in the first instance, pictures where. the longer axis of the camera is arranged horizontally, and, in the second instance, where the longer axis of the camera is arranged vertically. In this figure, (H dcsignattiti the-finder frame carrying the usual lcns aud pivoted at ($5 upon a lirzu-ltet tifi projecting out from the body of thecamcra. In Fig. 13 the finder illustrated as 1n aposltio'n to take pictures whose extreme length extends vertically, While in F ig. ll the finder is shifted-so as to take pictures where the length of the picture runs horizontally.

Mounted upon the shaft12l is a gear wheel 67, which meshes with a gear wheel 68 of the same size. This gear Wheel 68 is mounted in a frame 69 having a guide 70, which extends vertically and a guide 71 which ex- 1 tends horizontally, the vertical guide 70 being adjacent the margin of the g ar wheel 68, while the guide 71 extends horizontally adjacent the gear wheel 67. Slidably mountsed onthe guide 71 is the rack 72 having an outwardly projecting pin 73, and slidably mounted on the guide 70 is the rack 74 h1V. ing an outwardly projecting pin 75. The indicator arm 20 is pivoted to the camera frame and has an outwardly projecting arm 76 having apin 77 which engages in the angular slotted end 78 of a connecting rod 79, which is equivalent to the connecting rod 23. This connecting rod 79 moves in a guide 80 fast upon the face of the finder frame (54. The lower end of this connecting rod 79 is provided with a head 81, which is disposed in an inclined relation to" the axis of the rod 79, this head being notched or bifurcated at its oppositeends as at 82 and 83.

\Vith the parts as above described, when the finder is in a position to take vertical pictures, the notch 82 will engage with the pin 73 on the rack 72 and a rotation of the shaft 24 and a consequent rotation of the gear wheel 67 will cause the rotation of the 100 gear wheel 68 and this will cause an upward movement of the rack, which will cause the signal arm 20 to. shift to the position shown in Fig. 13 and across the lens of the finder. A counterrotation of the shaft 24 will cause a retraction of the indicator arm 20 to the position shown in dotted lines in Fig. 13. Now when the finder is turned intothe horizontal position shown in Fig. 14, the rod 79 will swing with the finder through a quarter circle'so that the notch 83 will engage with the pin 75 on the rack 74. Then upolr a rotation of 'the shaft 2&1 the gear wheel (37 will 'ause the rack 7-L to more t0- ward the right in Fig. 14, causing the inch cater .to move from its concealed position to its exposed position. As illust 'ated in Fig. 15, the guides 70 and 71 are preferably formed of strips of metal and the racks 72 'and 7-1 are formedwvith T-shaped slots 84:

to receive the guides. Of course it is to be understood that the shaft 2-l carries the gears heretofore described and that the remainder of the mechanism is precisely the same as is indicated in Figs. 1 and 2.

Vhile I have heretofore described means whereby an obstructing member is shifted across the field of the finder in order to obstruct the 'view therethrough until such timev as the film is .wound forthe uev exactuating mechanism, this member being;

- pivoted at S-il, and when the cable release is actuated, this member is shifted from its full line position to its dotted line position and back again. I have not illustrated any other portion of the shutter or shutter opertiling mechanism, I do not deem it necessary to d so. Coacting with the member is a shaft. which carries upon its inner (l end the gear wheel 86 which is engaged by the rack 18 which in turn is engaged by the plunger 18 at the end of the branch 16 of the cable release 15. The gear wheel 86 corresponds to the geur wheel 2 in 8 9 and it is to be understood that. the shaft carries upon it the gear wheel 27, and the mechanism for connecting this gear wheel to the winding shaft 50, all as previcusl v described.

ll'lounted upon the end of the shaft 85 is a sleeve or shaft sect-ion 8? which can rotate independently of the shaft. but connected to the .shaiit 85 to' rotate therewith by an internal coil spring Carried upon the end of the sleeve 87 is locking arm or latch Nov: when the rack 18* is shifted toward the right in 17., a clockwise rota-- tion will be communicated to the shaft 85 which "will cause the latch arm 85) to move downward. At the some time the member 83 is $1 ii lied upward by the action 01 the cable release. and meets and engages. with the latch arm 8) when this lat-ch arm has moved but a f action its full movement. The shaft 85 continues to rotate in a clock- Wise dire-idiom; b t the sleeve 8'? held from lion and he spring ll. placed under .i-on. As wor however, as the member Lwreturus toils full line position in Fig.

.lllllLlQ il llll'S bQGll ClOSMi fill" in 17, where the so icing; under tension will eat e t :1 ol: hie latch arm #9 to a locking: where it is disposed vertically and. prevents this member from again being actimteifl by the cable release until the film has been wound up. A. Winding: ,up of the film will rotate the shaft in :i countor-clockwise direction and this vi -Ll carry the locking lL-OSll'lOil re upon the member and 6% to its approximately horizontal position again and release the shutter mechanism.

a so that it may be again actuated by the cable release.

It will be seen that in all lorms of my construction, the actuation of the shutter actuating mechanism will cause the operation obstructing device to shift to an obstructive position, and that the obstructing device will remain in this position until the exposed film is wound up. The first quarter turn of the film winding shaft will cause the ob structing device to be shifted to a. retracted vor unexposed position and it will remain in this-position until another exposureis made. While I have illustrated a particular cmbodnnent of n'iy inventlon which I believe to be particularly eil'ective, I wish it understood that various changes might be made in the details of the mechanism and the arrangement of the parts without departing from the Spirit of the invention. Thus it is possible to use a flexible shaft between the winding key shaft 50 and the shaft 24 of the shaft 85 and in Fig. 19, I show a connection of this character. In this figure, 27 designates the gear wheel. carried by the clutch member 62 mounted upon the shaft 2+l, this shaft being provided in turn with a gear wieel which is rotated by the rack 18, as illustrated in Fig. 7 and Fig. 18 but this beveled gear wheel 27 is driven by a.

beveled gear w ieel 90 opcratively connected v to a flexible shaft 91, which extends from the bracket 92 into the interior of the camera casing and through a bracket. 93 mounted on the wall oi the-camera casing. This flexible shaft at this and carries a beveled gear wheel 9 engaging" with a beveled gear wheel 95. provided with a shaft 96 extending through the wall of the camera box, this shaft 96 carrying a gear wheel .97 engaged by agear wheel 98 mounted on the winding shaft 50. which carries the Winding-key 51. It will be obvious that the operation of this mechanism will be precisely the same as that heretofore described, without the complication caused by the use of the shafts 42, 45,

'33, and A rotation ol the key 51 in- Fig. will (11150 a rotation of the flexible shaft QL and this in turn will cause a rotution of the gear wheel 27 aud the shaft ill to carry the indicator E of the finger 89 back to its noruial position, af er which the clutch yields so that a continued rotation oi the clutch will not further shift the. indicator or the finger. The movement of the indicator or the linger, by actuating: the shutter role; so, does not. of .coursc affect the shaft 91.

Having: thus described my invention what I claim is:

1. The combination with a camera having a shutter operating device auda finder of an indicator pi voially mounted upon the finder and shii table into a position out of the hold of the finder or into said ficld.-and means for operating said indicator comprising a sliding bar operatively engaged with the indicator torotute it upon the shifting of the bar in one direction, said har being operatively enmovement of the slide in one direction, said phmger normally abutting against the slide and shifting the slide to carry the indicator into operative position upon the actuation of the cable release.

3. The con'ibination with a camera including a finder and a cable release, said cable release having a branch includinga plunger provided with a head, of an indicator movable into position across the field of the finder or out of such position, a slide operatively engaged with the indicator to shift it,

and means for automatically returning the indicator to its inoperative position upon the winding up of the exposed film within the camera.

at. The combination witlra camera having a film winding'roll, a finder and a shutter operating cable release, of means for preventing double exposures comprising an indicator pivotally mounted upon the finder and shiftable into or out of a position across the field of the finder, means actuated by the cable release for shifting the indicator into its operative position across said field, and means actuated b i a rotation of the roll causing the retraction of said indicator.

5. The combination tvith a camera having a film winding roll, a door shiftable into or out of a position at right angles to the camera, a bellows, a lens supporting member mounted on the bellows slidably engaged with the camera, a finder mounted thereon, and a branch cable release for actuating the shutter of the camera, of means for preventing double exposure comprising an indicator pirotallv mounted upon the finder and shiftable ino or out of a position across the finder, a member operatively engaged with the indicator to cause it to move into operative position, a plunger carried in one of the branches of the cable release and engageable with said sliding member upon an actuation of the cable release, and means for returning the indicator to its initial position comprising a shaft mounted upon the door of the camera, a shaft geared therewith and mount-;

ed upon the lens support and operatively engaged with said slide and with the first named shaft, a shaft mounted inside the body of the camera and operatively engaged to rotate with the film. winding roller, and operative connections between said last named shaft and the first named shaft to cause a rotation of the first named shaft and a retraction of the indicator upon a rotation .of the film winding roller.

6. The combination with a camera having a film winding roll, a door shiftable into or out of a position at right angles to the camera, a bellows, a lens supporting member mounted on the bellows slidably engaged with the camera, a. finder mounted thereon, and a branch cable release for actuating the shutter of the camera, of means for preventing double exposure comprising an indicator pivotally mounted upon the finder and shiftable into or out of a position across the finder, a member operatively engaged with the indicator to cause it to move into operative position, a plunger carried in one of the branches of the cable release and engageable with said sliding member upon an actuation of the cable release, and means for returning the indicator to its initial position comprising a shaft mounted upon the door of the camera, a shaft geared therewith and mounted upon the lens support and operatively engaged with said slide and with the first named shaft, a shaft mounted inside the body of the camera and operatively engaged to rotate with the film winding roller, operative connections between said last named shaft and the first named shaft to cause a rotation of the first named shaft and a re traction of the indicator upon a rotation of the film winding roller, said connections including coacting clutch members, a spring urging said clutch members toward each other, and means causing a disengagement of the clutch members after a prec etermined rotation of the first named shaft.

7. The combination with a camera having a film winding roll, a. finder, and a shutter actuating device, of an indicator mounted upon the finder and movable into a position across the. field of the finder and shiftablc into such position by an actuation of the shutter actuating device,'and means for rcturning the indicator to an inoperative position upon a rotation of the roll to wind up a film and including coacting clutch members, one ofsaid clutch members being operatively connected to the winding roll and the other beingoperatively connected to the indicator to cause its rotation, a spring urgingthe clutch members into engagement Witheach other, an arcuate guide, a pin carried by one of said clutch members and engaging on one side of said guide when the clutch members are in engagement, and a spring stronger than .th'first named spring extending be.- hind the arcuate guide and beyond it to cause a pin to be forced into a plane beyond the outer face of the guide when the pin has passed the lower end of the guide, said first named spring forcing the clutch members into engagement with each othe after the one of said Wheels being disposed oncentrically to the axis of rotation of the door.

15. A camera having a body, a door hinged thereto, a bellows attached to the body and .mounted upon the door, a film Winding roll member to its obstructing position, and

means acting upon a rotation of the film Winding roll for causing the obstructing member to return to its non-obstructing position and including shafts mounted upon the door and upon the camera body, the last named shaft being operatively connected to the film winding roll, and beveled gear Wheels operatively connecting the shafts, one of said Wheels being disposed concentrically to the axis of rotation of the door, the means for causing a retraction of the operation of the obstructing member to its non-obstructing position becoming operati 'ely disengaged from said member when the member has been completely returned to its inoperative position.

In testimony whereof I hereunto atiiX my signature in the presence of two witnesses. RICHARD (J. PETERSON.

Witnesses L. V. Connnsn, G. R. PA'iTnnsfln, 

